Pretty sure the internal precision setting works the same way on the 8087, it's documented in the original 8087 datasheet. Windows sets it to 53-bit so there ar

Pretty sure the internal precision setting works the same way on the 8087, it's documented in the original 8087 datasheet. Windows sets it to 53-bit so there are no excess precision surprises with doubles, and you could run Windows 95 with an 80386 + 80287.